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StrError & PERROR use yyds dry inventory

2022-07-06 03:08:00 【Mango_ Mango】

summary ：

strlen - Library function for finding string length

strcpy- String copy function

strcat - character string ( Connect ) Append function

strncpy() - String copy function - Can control the number of characters copied

strncat() - String append function

strncmp() - String comparison function

strstr - String lookup function

strtok - String cutting

memcpy()- Memory copy function

memmove- Memory copy function （ Can handle overlapping memory copies ）

memcmp： Memory compare function

memset - Memory setting function

strerror- Can return C The error message corresponding to the error code built in the language

perror - Print custom content +strerror

Error message reporting function

strerror- Can return C The error message corresponding to the error code built in the language

strerror&perror Use #yyds Dry inventory # _ error message

Return the error information corresponding to the error code

Parameter error code , Translate into error message , The first character address of the error message string corresponding to the error code is returned

C When a language library function call fails , Will store the error code in errno variable

#include<string.h>
int main()
{
     printf("%s\n",strerror(0));
     printf("%s\n",strerror(1));
     printf("%s\n",strerror(2));
     printf("%s\n",strerror(3));
    return 0;
}

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application ：

int main()
{
    FILE* pf = fopen("test.txt","r");
    if(pf == NULL)
    {
        printf("%s\n",strerror(errno));	//C Will put the error code in errno Variable , Print the error message corresponding to the error code 
        
    }
    else
    {
        printf(" Open the success \n");
    }
    return 0;
}
//fopen(): Functions for opening files , If the opening is successful , Returns a file pointer to the file FILE*  If not, return to NULL
//r： Read only open 

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Since we don't have this file ： So print the results

No such file or directory

perror - Print custom content +strerror

strerror&perror Use #yyds Dry inventory # _ error message _02

string： Custom characters

int main()
{
    FILE* pf = fopen("test.txt", "r");
    if (pf == NULL)
    {
        perror(" test ");
        perror(" test :\n");
        perror("\n");
    }
    else
    {
        printf(" Open the success \n");
    }
    return 0;
}

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